Make mix.release script rand() work with busybox (#10645)
Make mix.release script rand() work with busybox (#10645)

Combining dd, od and awk with the common arguments found in
busybox and GNU coreutils as well BSD the function rand() can
make correct id.

This is based on
https://github.com/erlware/relx/commit/200e12815ef665338cea1280244e9c4f9dfa06b9
and
https://github.com/erlware/relx/pull/828

Tested with busybox v1.29.3 with CONFIG_DESKTOP disabled.
kelvinst/elixir,kelvinst/elixir,pedrosnk/elixir,kimshrier/elixir,ggcampinho/elixir,elixir-lang/elixir,ggcampinho/elixir,pedrosnk/elixir,michalmuskala/elixir,joshprice/elixir,kimshrier/elixir